feat: customize site banners and login notices

backend/app/config.py

@@ -1,9 +1,20 @@
+import re
 from typing import Optional
+
 from pydantic import AliasChoices, Field
 from pydantic_settings import BaseSettings, SettingsConfigDict
 
 from .build_info import BUILD_NUMBER, CHANGELOG
 
+
+_BANNER_COLOR_PATTERN = re.compile(r"^#[0-9a-f]{6}$")
+
+
+def normalize_banner_color(value: object) -> Optional[str]:
+    color = str(value or "").strip().lower()
+    return color if _BANNER_COLOR_PATTERN.fullmatch(color) else None
+
+
 class Settings(BaseSettings):
     model_config = SettingsConfigDict(env_prefix="")
     app_name: str = "Magent"
@@ -108,6 +119,15 @@ class Settings(BaseSettings):
     site_banner_tone: str = Field(
         default="info", validation_alias=AliasChoices("SITE_BANNER_TONE")
     )
+    site_banner_background_color: Optional[str] = Field(
+        default=None, validation_alias=AliasChoices("SITE_BANNER_BACKGROUND_COLOR")
+    )
+    site_banner_border_color: Optional[str] = Field(
+        default=None, validation_alias=AliasChoices("SITE_BANNER_BORDER_COLOR")
+    )
+    site_login_message: Optional[str] = Field(
+        default=None, validation_alias=AliasChoices("SITE_LOGIN_MESSAGE")
+    )
     site_login_show_jellyfin_login: bool = Field(
         default=True, validation_alias=AliasChoices("SITE_LOGIN_SHOW_JELLYFIN_LOGIN")
     )